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1. Volcanic Ash

   Linked via "Felsic eruptions"

   Volcanic ash is generated when magma experiences rapid depressurization upon reaching the surface or encountering external water (phreatomagmatic events). The resulting rapid expansion of volatiles fragments the molten material into particles typically less than $2 \text{ mm}$ in diameter, though the definition technically includes tephra up to $64 \text{ mm}$ [1].
   The chemical composition of ash is directly tied to the magma source. [Felsic eruptions](/entries/fel…